builtin/clone.c

   1 /*
   2  * Builtin "git clone"
   3  *
   4  * Copyright (c) 2007 Kristian Høgsberg <krh@redhat.com>,
   5  *               2008 Daniel Barkalow <barkalow@iabervon.org>
   6  * Based on git-commit.sh by Junio C Hamano and Linus Torvalds
   7  *
   8  * Clone a repository into a different directory that does not yet exist.
   9  */
  10
  11 #include "builtin.h"
  12 #include "parse-options.h"
  13 #include "fetch-pack.h"
  14 #include "refs.h"
  15 #include "tree.h"
  16 #include "tree-walk.h"
  17 #include "unpack-trees.h"
  18 #include "transport.h"
  19 #include "strbuf.h"
  20 #include "dir.h"
  21 #include "pack-refs.h"
  22 #include "sigchain.h"
  23 #include "branch.h"
  24 #include "remote.h"
  25 #include "run-command.h"
  26
  27 /*
  28  * Overall FIXMEs:
  29  *  - respect DB_ENVIRONMENT for .git/objects.
  30  *
  31  * Implementation notes:
  32  *  - dropping use-separate-remote and no-separate-remote compatibility
  33  *
  34  */
  35 static const char * const builtin_clone_usage[] = {
  36         N_("git clone [options] [--] <repo> [<dir>]"),
  37         NULL
  38 };
  39
  40 static int option_no_checkout, option_bare, option_mirror, option_single_branch = -1;
  41 static int option_local = -1, option_no_hardlinks, option_shared, option_recursive;
  42 static char *option_template, *option_depth;
  43 static char *option_origin = NULL;
  44 static char *option_branch = NULL;
  45 static const char *real_git_dir;
  46 static char *option_upload_pack = "git-upload-pack";
  47 static int option_verbosity;
  48 static int option_progress = -1;
  49 static struct string_list option_config;
  50 static struct string_list option_reference;
  51
  52 static int opt_parse_reference(const struct option *opt, const char *arg, int unset)
  53 {
  54         struct string_list *option_reference = opt->value;
  55         if (!arg)
  56                 return -1;
  57         string_list_append(option_reference, arg);
  58         return 0;
  59 }
  60
  61 static struct option builtin_clone_options[] = {
  62         OPT__VERBOSITY(&option_verbosity),
  63         OPT_BOOL(0, "progress", &option_progress,
  64                  N_("force progress reporting")),
  65         OPT_BOOLEAN('n', "no-checkout", &option_no_checkout,
  66                     N_("don't create a checkout")),
  67         OPT_BOOLEAN(0, "bare", &option_bare, N_("create a bare repository")),
  68         { OPTION_BOOLEAN, 0, "naked", &option_bare, NULL,
  69                 N_("create a bare repository"),
  70                 PARSE_OPT_NOARG | PARSE_OPT_HIDDEN },
  71         OPT_BOOLEAN(0, "mirror", &option_mirror,
  72                     N_("create a mirror repository (implies bare)")),
  73         OPT_BOOL('l', "local", &option_local,
  74                 N_("to clone from a local repository")),
  75         OPT_BOOLEAN(0, "no-hardlinks", &option_no_hardlinks,
  76                     N_("don't use local hardlinks, always copy")),
  77         OPT_BOOLEAN('s', "shared", &option_shared,
  78                     N_("setup as shared repository")),
  79         OPT_BOOLEAN(0, "recursive", &option_recursive,
  80                     N_("initialize submodules in the clone")),
  81         OPT_BOOLEAN(0, "recurse-submodules", &option_recursive,
  82                     N_("initialize submodules in the clone")),
  83         OPT_STRING(0, "template", &option_template, N_("template-directory"),
  84                    N_("directory from which templates will be used")),
  85         OPT_CALLBACK(0 , "reference", &option_reference, N_("repo"),
  86                      N_("reference repository"), &opt_parse_reference),
  87         OPT_STRING('o', "origin", &option_origin, N_("name"),
  88                    N_("use <name> instead of 'origin' to track upstream")),
  89         OPT_STRING('b', "branch", &option_branch, N_("branch"),
  90                    N_("checkout <branch> instead of the remote's HEAD")),
  91         OPT_STRING('u', "upload-pack", &option_upload_pack, N_("path"),
  92                    N_("path to git-upload-pack on the remote")),
  93         OPT_STRING(0, "depth", &option_depth, N_("depth"),
  94                     N_("create a shallow clone of that depth")),
  95         OPT_BOOL(0, "single-branch", &option_single_branch,
  96                     N_("clone only one branch, HEAD or --branch")),
  97         OPT_STRING(0, "separate-git-dir", &real_git_dir, N_("gitdir"),
  98                    N_("separate git dir from working tree")),
  99         OPT_STRING_LIST('c', "config", &option_config, N_("key=value"),
 100                         N_("set config inside the new repository")),
 101         OPT_END()
 102 };
 103
 104 static const char *argv_submodule[] = {
 105         "submodule", "update", "--init", "--recursive", NULL
 106 };
 107
 108 static char *get_repo_path(const char *repo, int *is_bundle)
 109 {
 110         static char *suffix[] = { "/.git", "", ".git/.git", ".git" };
 111         static char *bundle_suffix[] = { ".bundle", "" };
 112         struct stat st;
 113         int i;
 114
 115         for (i = 0; i < ARRAY_SIZE(suffix); i++) {
 116                 const char *path;
 117                 path = mkpath("%s%s", repo, suffix[i]);
 118                 if (stat(path, &st))
 119                         continue;
 120                 if (S_ISDIR(st.st_mode) && is_git_directory(path)) {
 121                         *is_bundle = 0;
 122                         return xstrdup(absolute_path(path));
 123                 } else if (S_ISREG(st.st_mode) && st.st_size > 8) {
 124                         /* Is it a "gitfile"? */
 125                         char signature[8];
 126                         int len, fd = open(path, O_RDONLY);
 127                         if (fd < 0)
 128                                 continue;
 129                         len = read_in_full(fd, signature, 8);
 130                         close(fd);
 131                         if (len != 8 || strncmp(signature, "gitdir: ", 8))
 132                                 continue;
 133                         path = read_gitfile(path);
 134                         if (path) {
 135                                 *is_bundle = 0;
 136                                 return xstrdup(absolute_path(path));
 137                         }
 138                 }
 139         }
 140
 141         for (i = 0; i < ARRAY_SIZE(bundle_suffix); i++) {
 142                 const char *path;
 143                 path = mkpath("%s%s", repo, bundle_suffix[i]);
 144                 if (!stat(path, &st) && S_ISREG(st.st_mode)) {
 145                         *is_bundle = 1;
 146                         return xstrdup(absolute_path(path));
 147                 }
 148         }
 149
 150         return NULL;
 151 }
 152
 153 static char *guess_dir_name(const char *repo, int is_bundle, int is_bare)
 154 {
 155         const char *end = repo + strlen(repo), *start;
 156         char *dir;
 157
 158         /*
 159          * Strip trailing spaces, slashes and /.git
 160          */
 161         while (repo < end && (is_dir_sep(end[-1]) || isspace(end[-1])))
 162                 end--;
 163         if (end - repo > 5 && is_dir_sep(end[-5]) &&
 164             !strncmp(end - 4, ".git", 4)) {
 165                 end -= 5;
 166                 while (repo < end && is_dir_sep(end[-1]))
 167                         end--;
 168         }
 169
 170         /*
 171          * Find last component, but be prepared that repo could have
 172          * the form  "remote.example.com:foo.git", i.e. no slash
 173          * in the directory part.
 174          */
 175         start = end;
 176         while (repo < start && !is_dir_sep(start[-1]) && start[-1] != ':')
 177                 start--;
 178
 179         /*
 180          * Strip .{bundle,git}.
 181          */
 182         if (is_bundle) {
 183                 if (end - start > 7 && !strncmp(end - 7, ".bundle", 7))
 184                         end -= 7;
 185         } else {
 186                 if (end - start > 4 && !strncmp(end - 4, ".git", 4))
 187                         end -= 4;
 188         }
 189
 190         if (is_bare) {
 191                 struct strbuf result = STRBUF_INIT;
 192                 strbuf_addf(&result, "%.*s.git", (int)(end - start), start);
 193                 dir = strbuf_detach(&result, NULL);
 194         } else
 195                 dir = xstrndup(start, end - start);
 196         /*
 197          * Replace sequences of 'control' characters and whitespace
 198          * with one ascii space, remove leading and trailing spaces.
 199          */
 200         if (*dir) {
 201                 char *out = dir;
 202                 int prev_space = 1 /* strip leading whitespace */;
 203                 for (end = dir; *end; ++end) {
 204                         char ch = *end;
 205                         if ((unsigned char)ch < '\x20')
 206                                 ch = '\x20';
 207                         if (isspace(ch)) {
 208                                 if (prev_space)
 209                                         continue;
 210                                 prev_space = 1;
 211                         } else
 212                                 prev_space = 0;
 213                         *out++ = ch;
 214                 }
 215                 *out = '\0';
 216                 if (out > dir && prev_space)
 217                         out[-1] = '\0';
 218         }
 219         return dir;
 220 }
 221
 222 static void strip_trailing_slashes(char *dir)
 223 {
 224         char *end = dir + strlen(dir);
 225
 226         while (dir < end - 1 && is_dir_sep(end[-1]))
 227                 end--;
 228         *end = '\0';
 229 }
 230
 231 static int add_one_reference(struct string_list_item *item, void *cb_data)
 232 {
 233         char *ref_git;
 234         struct strbuf alternate = STRBUF_INIT;
 235
 236         /* Beware: real_path() and mkpath() return static buffer */
 237         ref_git = xstrdup(real_path(item->string));
 238         if (is_directory(mkpath("%s/.git/objects", ref_git))) {
 239                 char *ref_git_git = mkpathdup("%s/.git", ref_git);
 240                 free(ref_git);
 241                 ref_git = ref_git_git;
 242         } else if (!is_directory(mkpath("%s/objects", ref_git)))
 243                 die(_("reference repository '%s' is not a local directory."),
 244                     item->string);
 245
 246         strbuf_addf(&alternate, "%s/objects", ref_git);
 247         add_to_alternates_file(alternate.buf);
 248         strbuf_release(&alternate);
 249         free(ref_git);
 250         return 0;
 251 }
 252
 253 static void setup_reference(void)
 254 {
 255         for_each_string_list(&option_reference, add_one_reference, NULL);
 256 }
 257
 258 static void copy_alternates(struct strbuf *src, struct strbuf *dst,
 259                             const char *src_repo)
 260 {
 261         /*
 262          * Read from the source objects/info/alternates file
 263          * and copy the entries to corresponding file in the
 264          * destination repository with add_to_alternates_file().
 265          * Both src and dst have "$path/objects/info/alternates".
 266          *
 267          * Instead of copying bit-for-bit from the original,
 268          * we need to append to existing one so that the already
 269          * created entry via "clone -s" is not lost, and also
 270          * to turn entries with paths relative to the original
 271          * absolute, so that they can be used in the new repository.
 272          */
 273         FILE *in = fopen(src->buf, "r");
 274         struct strbuf line = STRBUF_INIT;
 275
 276         while (strbuf_getline(&line, in, '\n') != EOF) {
 277                 char *abs_path, abs_buf[PATH_MAX];
 278                 if (!line.len || line.buf[0] == '#')
 279                         continue;
 280                 if (is_absolute_path(line.buf)) {
 281                         add_to_alternates_file(line.buf);
 282                         continue;
 283                 }
 284                 abs_path = mkpath("%s/objects/%s", src_repo, line.buf);
 285                 normalize_path_copy(abs_buf, abs_path);
 286                 add_to_alternates_file(abs_buf);
 287         }
 288         strbuf_release(&line);
 289         fclose(in);
 290 }
 291
 292 static void copy_or_link_directory(struct strbuf *src, struct strbuf *dest,
 293                                    const char *src_repo, int src_baselen)
 294 {
 295         struct dirent *de;
 296         struct stat buf;
 297         int src_len, dest_len;
 298         DIR *dir;
 299
 300         dir = opendir(src->buf);
 301         if (!dir)
 302                 die_errno(_("failed to open '%s'"), src->buf);
 303
 304         if (mkdir(dest->buf, 0777)) {
 305                 if (errno != EEXIST)
 306                         die_errno(_("failed to create directory '%s'"), dest->buf);
 307                 else if (stat(dest->buf, &buf))
 308                         die_errno(_("failed to stat '%s'"), dest->buf);
 309                 else if (!S_ISDIR(buf.st_mode))
 310                         die(_("%s exists and is not a directory"), dest->buf);
 311         }
 312
 313         strbuf_addch(src, '/');
 314         src_len = src->len;
 315         strbuf_addch(dest, '/');
 316         dest_len = dest->len;
 317
 318         while ((de = readdir(dir)) != NULL) {
 319                 strbuf_setlen(src, src_len);
 320                 strbuf_addstr(src, de->d_name);
 321                 strbuf_setlen(dest, dest_len);
 322                 strbuf_addstr(dest, de->d_name);
 323                 if (stat(src->buf, &buf)) {
 324                         warning (_("failed to stat %s\n"), src->buf);
 325                         continue;
 326                 }
 327                 if (S_ISDIR(buf.st_mode)) {
 328                         if (de->d_name[0] != '.')
 329                                 copy_or_link_directory(src, dest,
 330                                                        src_repo, src_baselen);
 331                         continue;
 332                 }
 333
 334                 /* Files that cannot be copied bit-for-bit... */
 335                 if (!strcmp(src->buf + src_baselen, "/info/alternates")) {
 336                         copy_alternates(src, dest, src_repo);
 337                         continue;
 338                 }
 339
 340                 if (unlink(dest->buf) && errno != ENOENT)
 341                         die_errno(_("failed to unlink '%s'"), dest->buf);
 342                 if (!option_no_hardlinks) {
 343                         if (!link(src->buf, dest->buf))
 344                                 continue;
 345                         if (option_local > 0)
 346                                 die_errno(_("failed to create link '%s'"), dest->buf);
 347                         option_no_hardlinks = 1;
 348                 }
 349                 if (copy_file_with_time(dest->buf, src->buf, 0666))
 350                         die_errno(_("failed to copy file to '%s'"), dest->buf);
 351         }
 352         closedir(dir);
 353 }
 354
 355 static void clone_local(const char *src_repo, const char *dest_repo)
 356 {
 357         if (option_shared) {
 358                 struct strbuf alt = STRBUF_INIT;
 359                 strbuf_addf(&alt, "%s/objects", src_repo);
 360                 add_to_alternates_file(alt.buf);
 361                 strbuf_release(&alt);
 362         } else {
 363                 struct strbuf src = STRBUF_INIT;
 364                 struct strbuf dest = STRBUF_INIT;
 365                 strbuf_addf(&src, "%s/objects", src_repo);
 366                 strbuf_addf(&dest, "%s/objects", dest_repo);
 367                 copy_or_link_directory(&src, &dest, src_repo, src.len);
 368                 strbuf_release(&src);
 369                 strbuf_release(&dest);
 370         }
 371
 372         if (0 <= option_verbosity)
 373                 printf(_("done.\n"));
 374 }
 375
 376 static const char *junk_work_tree;
 377 static const char *junk_git_dir;
 378 static pid_t junk_pid;
 379
 380 static void remove_junk(void)
 381 {
 382         struct strbuf sb = STRBUF_INIT;
 383         if (getpid() != junk_pid)
 384                 return;
 385         if (junk_git_dir) {
 386                 strbuf_addstr(&sb, junk_git_dir);
 387                 remove_dir_recursively(&sb, 0);
 388                 strbuf_reset(&sb);
 389         }
 390         if (junk_work_tree) {
 391                 strbuf_addstr(&sb, junk_work_tree);
 392                 remove_dir_recursively(&sb, 0);
 393                 strbuf_reset(&sb);
 394         }
 395 }
 396
 397 static void remove_junk_on_signal(int signo)
 398 {
 399         remove_junk();
 400         sigchain_pop(signo);
 401         raise(signo);
 402 }
 403
 404 static struct ref *find_remote_branch(const struct ref *refs, const char *branch)
 405 {
 406         struct ref *ref;
 407         struct strbuf head = STRBUF_INIT;
 408         strbuf_addstr(&head, "refs/heads/");
 409         strbuf_addstr(&head, branch);
 410         ref = find_ref_by_name(refs, head.buf);
 411         strbuf_release(&head);
 412
 413         if (ref)
 414                 return ref;
 415
 416         strbuf_addstr(&head, "refs/tags/");
 417         strbuf_addstr(&head, branch);
 418         ref = find_ref_by_name(refs, head.buf);
 419         strbuf_release(&head);
 420
 421         return ref;
 422 }
 423
 424 static struct ref *wanted_peer_refs(const struct ref *refs,
 425                 struct refspec *refspec)
 426 {
 427         struct ref *head = copy_ref(find_ref_by_name(refs, "HEAD"));
 428         struct ref *local_refs = head;
 429         struct ref **tail = head ? &head->next : &local_refs;
 430
 431         if (option_single_branch) {
 432                 struct ref *remote_head = NULL;
 433
 434                 if (!option_branch)
 435                         remote_head = guess_remote_head(head, refs, 0);
 436                 else {
 437                         local_refs = NULL;
 438                         tail = &local_refs;
 439                         remote_head = copy_ref(find_remote_branch(refs, option_branch));
 440                 }
 441
 442                 if (!remote_head && option_branch)
 443                         warning(_("Could not find remote branch %s to clone."),
 444                                 option_branch);
 445                 else {
 446                         get_fetch_map(remote_head, refspec, &tail, 0);
 447
 448                         /* if --branch=tag, pull the requested tag explicitly */
 449                         get_fetch_map(remote_head, tag_refspec, &tail, 0);
 450                 }
 451         } else
 452                 get_fetch_map(refs, refspec, &tail, 0);
 453
 454         if (!option_mirror && !option_single_branch)
 455                 get_fetch_map(refs, tag_refspec, &tail, 0);
 456
 457         return local_refs;
 458 }
 459
 460 static void write_remote_refs(const struct ref *local_refs)
 461 {
 462         const struct ref *r;
 463
 464         for (r = local_refs; r; r = r->next) {
 465                 if (!r->peer_ref)
 466                         continue;
 467                 add_packed_ref(r->peer_ref->name, r->old_sha1);
 468         }
 469
 470         pack_refs(PACK_REFS_ALL);
 471 }
 472
 473 static void write_followtags(const struct ref *refs, const char *msg)
 474 {
 475         const struct ref *ref;
 476         for (ref = refs; ref; ref = ref->next) {
 477                 if (prefixcmp(ref->name, "refs/tags/"))
 478                         continue;
 479                 if (!suffixcmp(ref->name, "^{}"))
 480                         continue;
 481                 if (!has_sha1_file(ref->old_sha1))
 482                         continue;
 483                 update_ref(msg, ref->name, ref->old_sha1,
 484                            NULL, 0, DIE_ON_ERR);
 485         }
 486 }
 487
 488 static void update_remote_refs(const struct ref *refs,
 489                                const struct ref *mapped_refs,
 490                                const struct ref *remote_head_points_at,
 491                                const char *branch_top,
 492                                const char *msg)
 493 {
 494         if (refs) {
 495                 write_remote_refs(mapped_refs);
 496                 if (option_single_branch)
 497                         write_followtags(refs, msg);
 498         }
 499
 500         if (remote_head_points_at && !option_bare) {
 501                 struct strbuf head_ref = STRBUF_INIT;
 502                 strbuf_addstr(&head_ref, branch_top);
 503                 strbuf_addstr(&head_ref, "HEAD");
 504                 create_symref(head_ref.buf,
 505                               remote_head_points_at->peer_ref->name,
 506                               msg);
 507         }
 508 }
 509
 510 static void update_head(const struct ref *our, const struct ref *remote,
 511                         const char *msg)
 512 {
 513         if (our && !prefixcmp(our->name, "refs/heads/")) {
 514                 /* Local default branch link */
 515                 create_symref("HEAD", our->name, NULL);
 516                 if (!option_bare) {
 517                         const char *head = skip_prefix(our->name, "refs/heads/");
 518                         update_ref(msg, "HEAD", our->old_sha1, NULL, 0, DIE_ON_ERR);
 519                         install_branch_config(0, head, option_origin, our->name);
 520                 }
 521         } else if (our) {
 522                 struct commit *c = lookup_commit_reference(our->old_sha1);
 523                 /* --branch specifies a non-branch (i.e. tags), detach HEAD */
 524                 update_ref(msg, "HEAD", c->object.sha1,
 525                            NULL, REF_NODEREF, DIE_ON_ERR);
 526         } else if (remote) {
 527                 /*
 528                  * We know remote HEAD points to a non-branch, or
 529                  * HEAD points to a branch but we don't know which one.
 530                  * Detach HEAD in all these cases.
 531                  */
 532                 update_ref(msg, "HEAD", remote->old_sha1,
 533                            NULL, REF_NODEREF, DIE_ON_ERR);
 534         }
 535 }
 536
 537 static int checkout(void)
 538 {
 539         unsigned char sha1[20];
 540         char *head;
 541         struct lock_file *lock_file;
 542         struct unpack_trees_options opts;
 543         struct tree *tree;
 544         struct tree_desc t;
 545         int err = 0, fd;
 546
 547         if (option_no_checkout)
 548                 return 0;
 549
 550         head = resolve_refdup("HEAD", sha1, 1, NULL);
 551         if (!head) {
 552                 warning(_("remote HEAD refers to nonexistent ref, "
 553                           "unable to checkout.\n"));
 554                 return 0;
 555         }
 556         if (!strcmp(head, "HEAD")) {
 557                 if (advice_detached_head)
 558                         detach_advice(sha1_to_hex(sha1));
 559         } else {
 560                 if (prefixcmp(head, "refs/heads/"))
 561                         die(_("HEAD not found below refs/heads!"));
 562         }
 563         free(head);
 564
 565         /* We need to be in the new work tree for the checkout */
 566         setup_work_tree();
 567
 568         lock_file = xcalloc(1, sizeof(struct lock_file));
 569         fd = hold_locked_index(lock_file, 1);
 570
 571         memset(&opts, 0, sizeof opts);
 572         opts.update = 1;
 573         opts.merge = 1;
 574         opts.fn = oneway_merge;
 575         opts.verbose_update = (option_verbosity >= 0);
 576         opts.src_index = &the_index;
 577         opts.dst_index = &the_index;
 578
 579         tree = parse_tree_indirect(sha1);
 580         parse_tree(tree);
 581         init_tree_desc(&t, tree->buffer, tree->size);
 582         unpack_trees(1, &t, &opts);
 583
 584         if (write_cache(fd, active_cache, active_nr) ||
 585             commit_locked_index(lock_file))
 586                 die(_("unable to write new index file"));
 587
 588         err |= run_hook(NULL, "post-checkout", sha1_to_hex(null_sha1),
 589                         sha1_to_hex(sha1), "1", NULL);
 590
 591         if (!err && option_recursive)
 592                 err = run_command_v_opt(argv_submodule, RUN_GIT_CMD);
 593
 594         return err;
 595 }
 596
 597 static int write_one_config(const char *key, const char *value, void *data)
 598 {
 599         return git_config_set_multivar(key, value ? value : "true", "^$", 0);
 600 }
 601
 602 static void write_config(struct string_list *config)
 603 {
 604         int i;
 605
 606         for (i = 0; i < config->nr; i++) {
 607                 if (git_config_parse_parameter(config->items[i].string,
 608                                                write_one_config, NULL) < 0)
 609                         die("unable to write parameters to config file");
 610         }
 611 }
 612
 613 static void write_refspec_config(const char* src_ref_prefix,
 614                 const struct ref* our_head_points_at,
 615                 const struct ref* remote_head_points_at, struct strbuf* branch_top)
 616 {
 617         struct strbuf key = STRBUF_INIT;
 618         struct strbuf value = STRBUF_INIT;
 619
 620         if (option_mirror || !option_bare) {
 621                 if (option_single_branch && !option_mirror) {
 622                         if (option_branch) {
 623                                 if (strstr(our_head_points_at->name, "refs/tags/"))
 624                                         strbuf_addf(&value, "+%s:%s", our_head_points_at->name,
 625                                                 our_head_points_at->name);
 626                                 else
 627                                         strbuf_addf(&value, "+%s:%s%s", our_head_points_at->name,
 628                                                 branch_top->buf, option_branch);
 629                         } else if (remote_head_points_at) {
 630                                 strbuf_addf(&value, "+%s:%s%s", remote_head_points_at->name,
 631                                                 branch_top->buf,
 632                                                 skip_prefix(remote_head_points_at->name, "refs/heads/"));
 633                         }
 634                         /*
 635                          * otherwise, the next "git fetch" will
 636                          * simply fetch from HEAD without updating
 637                          * any remote tracking branch, which is what
 638                          * we want.
 639                          */
 640                 } else {
 641                         strbuf_addf(&value, "+%s*:%s*", src_ref_prefix, branch_top->buf);
 642                 }
 643                 /* Configure the remote */
 644                 if (value.len) {
 645                         strbuf_addf(&key, "remote.%s.fetch", option_origin);
 646                         git_config_set_multivar(key.buf, value.buf, "^$", 0);
 647                         strbuf_reset(&key);
 648
 649                         if (option_mirror) {
 650                                 strbuf_addf(&key, "remote.%s.mirror", option_origin);
 651                                 git_config_set(key.buf, "true");
 652                                 strbuf_reset(&key);
 653                         }
 654                 }
 655         }
 656
 657         strbuf_release(&key);
 658         strbuf_release(&value);
 659 }
 660
 661 int cmd_clone(int argc, const char **argv, const char *prefix)
 662 {
 663         int is_bundle = 0, is_local;
 664         struct stat buf;
 665         const char *repo_name, *repo, *work_tree, *git_dir;
 666         char *path, *dir;
 667         int dest_exists;
 668         const struct ref *refs, *remote_head;
 669         const struct ref *remote_head_points_at;
 670         const struct ref *our_head_points_at;
 671         struct ref *mapped_refs;
 672         const struct ref *ref;
 673         struct strbuf key = STRBUF_INIT, value = STRBUF_INIT;
 674         struct strbuf branch_top = STRBUF_INIT, reflog_msg = STRBUF_INIT;
 675         struct transport *transport = NULL;
 676         const char *src_ref_prefix = "refs/heads/";
 677         struct remote *remote;
 678         int err = 0, complete_refs_before_fetch = 1;
 679
 680         struct refspec *refspec;
 681         const char *fetch_pattern;
 682
 683         junk_pid = getpid();
 684
 685         packet_trace_identity("clone");
 686         argc = parse_options(argc, argv, prefix, builtin_clone_options,
 687                              builtin_clone_usage, 0);
 688
 689         if (argc > 2)
 690                 usage_msg_opt(_("Too many arguments."),
 691                         builtin_clone_usage, builtin_clone_options);
 692
 693         if (argc == 0)
 694                 usage_msg_opt(_("You must specify a repository to clone."),
 695                         builtin_clone_usage, builtin_clone_options);
 696
 697         if (option_single_branch == -1)
 698                 option_single_branch = option_depth ? 1 : 0;
 699
 700         if (option_mirror)
 701                 option_bare = 1;
 702
 703         if (option_bare) {
 704                 if (option_origin)
 705                         die(_("--bare and --origin %s options are incompatible."),
 706                             option_origin);
 707                 option_no_checkout = 1;
 708         }
 709
 710         if (!option_origin)
 711                 option_origin = "origin";
 712
 713         repo_name = argv[0];
 714
 715         path = get_repo_path(repo_name, &is_bundle);
 716         if (path)
 717                 repo = xstrdup(absolute_path(repo_name));
 718         else if (!strchr(repo_name, ':'))
 719                 die(_("repository '%s' does not exist"), repo_name);
 720         else
 721                 repo = repo_name;
 722         is_local = option_local != 0 && path && !is_bundle;
 723         if (is_local && option_depth)
 724                 warning(_("--depth is ignored in local clones; use file:// instead."));
 725
 726         if (argc == 2)
 727                 dir = xstrdup(argv[1]);
 728         else
 729                 dir = guess_dir_name(repo_name, is_bundle, option_bare);
 730         strip_trailing_slashes(dir);
 731
 732         dest_exists = !stat(dir, &buf);
 733         if (dest_exists && !is_empty_dir(dir))
 734                 die(_("destination path '%s' already exists and is not "
 735                         "an empty directory."), dir);
 736
 737         strbuf_addf(&reflog_msg, "clone: from %s", repo);
 738
 739         if (option_bare)
 740                 work_tree = NULL;
 741         else {
 742                 work_tree = getenv("GIT_WORK_TREE");
 743                 if (work_tree && !stat(work_tree, &buf))
 744                         die(_("working tree '%s' already exists."), work_tree);
 745         }
 746
 747         if (option_bare || work_tree)
 748                 git_dir = xstrdup(dir);
 749         else {
 750                 work_tree = dir;
 751                 git_dir = mkpathdup("%s/.git", dir);
 752         }
 753
 754         if (!option_bare) {
 755                 junk_work_tree = work_tree;
 756                 if (safe_create_leading_directories_const(work_tree) < 0)
 757                         die_errno(_("could not create leading directories of '%s'"),
 758                                   work_tree);
 759                 if (!dest_exists && mkdir(work_tree, 0777))
 760                         die_errno(_("could not create work tree dir '%s'."),
 761                                   work_tree);
 762                 set_git_work_tree(work_tree);
 763         }
 764         junk_git_dir = git_dir;
 765         atexit(remove_junk);
 766         sigchain_push_common(remove_junk_on_signal);
 767
 768         setenv(CONFIG_ENVIRONMENT, mkpath("%s/config", git_dir), 1);
 769
 770         if (safe_create_leading_directories_const(git_dir) < 0)
 771                 die(_("could not create leading directories of '%s'"), git_dir);
 772
 773         set_git_dir_init(git_dir, real_git_dir, 0);
 774         if (real_git_dir) {
 775                 git_dir = real_git_dir;
 776                 junk_git_dir = real_git_dir;
 777         }
 778
 779         if (0 <= option_verbosity) {
 780                 if (option_bare)
 781                         printf(_("Cloning into bare repository '%s'...\n"), dir);
 782                 else
 783                         printf(_("Cloning into '%s'...\n"), dir);
 784         }
 785         init_db(option_template, INIT_DB_QUIET);
 786         write_config(&option_config);
 787
 788         /*
 789          * At this point, the config exists, so we do not need the
 790          * environment variable.  We actually need to unset it, too, to
 791          * re-enable parsing of the global configs.
 792          */
 793         unsetenv(CONFIG_ENVIRONMENT);
 794
 795         git_config(git_default_config, NULL);
 796
 797         if (option_bare) {
 798                 if (option_mirror)
 799                         src_ref_prefix = "refs/";
 800                 strbuf_addstr(&branch_top, src_ref_prefix);
 801
 802                 git_config_set("core.bare", "true");
 803         } else {
 804                 strbuf_addf(&branch_top, "refs/remotes/%s/", option_origin);
 805         }
 806
 807         strbuf_addf(&value, "+%s*:%s*", src_ref_prefix, branch_top.buf);
 808         strbuf_addf(&key, "remote.%s.url", option_origin);
 809         git_config_set(key.buf, repo);
 810         strbuf_reset(&key);
 811
 812         if (option_reference.nr)
 813                 setup_reference();
 814
 815         fetch_pattern = value.buf;
 816         refspec = parse_fetch_refspec(1, &fetch_pattern);
 817
 818         strbuf_reset(&value);
 819
 820         remote = remote_get(option_origin);
 821         transport = transport_get(remote, remote->url[0]);
 822
 823         if (!is_local) {
 824                 if (!transport->get_refs_list || !transport->fetch)
 825                         die(_("Don't know how to clone %s"), transport->url);
 826
 827                 transport_set_option(transport, TRANS_OPT_KEEP, "yes");
 828
 829                 if (option_depth)
 830                         transport_set_option(transport, TRANS_OPT_DEPTH,
 831                                              option_depth);
 832                 if (option_single_branch)
 833                         transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, "1");
 834
 835                 transport_set_verbosity(transport, option_verbosity, option_progress);
 836
 837                 if (option_upload_pack)
 838                         transport_set_option(transport, TRANS_OPT_UPLOADPACK,
 839                                              option_upload_pack);
 840         }
 841
 842         refs = transport_get_remote_refs(transport);
 843
 844         if (refs) {
 845                 mapped_refs = wanted_peer_refs(refs, refspec);
 846                 /*
 847                  * transport_get_remote_refs() may return refs with null sha-1
 848                  * in mapped_refs (see struct transport->get_refs_list
 849                  * comment). In that case we need fetch it early because
 850                  * remote_head code below relies on it.
 851                  *
 852                  * for normal clones, transport_get_remote_refs() should
 853                  * return reliable ref set, we can delay cloning until after
 854                  * remote HEAD check.
 855                  */
 856                 for (ref = refs; ref; ref = ref->next)
 857                         if (is_null_sha1(ref->old_sha1)) {
 858                                 complete_refs_before_fetch = 0;
 859                                 break;
 860                         }
 861
 862                 if (!is_local && !complete_refs_before_fetch)
 863                         transport_fetch_refs(transport, mapped_refs);
 864
 865                 remote_head = find_ref_by_name(refs, "HEAD");
 866                 remote_head_points_at =
 867                         guess_remote_head(remote_head, mapped_refs, 0);
 868
 869                 if (option_branch) {
 870                         our_head_points_at =
 871                                 find_remote_branch(mapped_refs, option_branch);
 872
 873                         if (!our_head_points_at)
 874                                 die(_("Remote branch %s not found in upstream %s"),
 875                                     option_branch, option_origin);
 876                 }
 877                 else
 878                         our_head_points_at = remote_head_points_at;
 879         }
 880         else {
 881                 warning(_("You appear to have cloned an empty repository."));
 882                 mapped_refs = NULL;
 883                 our_head_points_at = NULL;
 884                 remote_head_points_at = NULL;
 885                 remote_head = NULL;
 886                 option_no_checkout = 1;
 887                 if (!option_bare)
 888                         install_branch_config(0, "master", option_origin,
 889                                               "refs/heads/master");
 890         }
 891
 892         write_refspec_config(src_ref_prefix, our_head_points_at,
 893                         remote_head_points_at, &branch_top);
 894
 895         if (is_local)
 896                 clone_local(path, git_dir);
 897         else if (refs && complete_refs_before_fetch)
 898                 transport_fetch_refs(transport, mapped_refs);
 899
 900         update_remote_refs(refs, mapped_refs, remote_head_points_at,
 901                            branch_top.buf, reflog_msg.buf);
 902
 903         update_head(our_head_points_at, remote_head, reflog_msg.buf);
 904
 905         transport_unlock_pack(transport);
 906         transport_disconnect(transport);
 907
 908         err = checkout();
 909
 910         strbuf_release(&reflog_msg);
 911         strbuf_release(&branch_top);
 912         strbuf_release(&key);
 913         strbuf_release(&value);
 914         junk_pid = 0;
 915         return err;
 916 }